1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * Copyright (c) 2014 Kevin Lo 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Robert N. M. Watson under 10 * contract to Juniper Networks, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the project nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 37 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 38 */ 39 40 /*- 41 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 42 * The Regents of the University of California. 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 70 */ 71 72 #include <sys/cdefs.h> 73 __FBSDID("$FreeBSD$"); 74 75 #include "opt_inet.h" 76 #include "opt_inet6.h" 77 #include "opt_ipsec.h" 78 #include "opt_rss.h" 79 80 #include <sys/param.h> 81 #include <sys/jail.h> 82 #include <sys/kernel.h> 83 #include <sys/lock.h> 84 #include <sys/mbuf.h> 85 #include <sys/priv.h> 86 #include <sys/proc.h> 87 #include <sys/protosw.h> 88 #include <sys/sdt.h> 89 #include <sys/signalvar.h> 90 #include <sys/socket.h> 91 #include <sys/socketvar.h> 92 #include <sys/sx.h> 93 #include <sys/sysctl.h> 94 #include <sys/syslog.h> 95 #include <sys/systm.h> 96 97 #include <net/if.h> 98 #include <net/if_var.h> 99 #include <net/if_types.h> 100 #include <net/route.h> 101 #include <net/rss_config.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_kdtrace.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/in_var.h> 108 #include <netinet/ip.h> 109 #include <netinet/ip6.h> 110 #include <netinet/icmp6.h> 111 #include <netinet/ip_var.h> 112 #include <netinet/udp.h> 113 #include <netinet/udp_var.h> 114 #include <netinet/udplite.h> 115 116 #include <netinet6/ip6protosw.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet6/in6_pcb.h> 119 #include <netinet6/in6_rss.h> 120 #include <netinet6/udp6_var.h> 121 #include <netinet6/scope6_var.h> 122 123 #include <netipsec/ipsec_support.h> 124 125 #include <security/mac/mac_framework.h> 126 127 /* 128 * UDP protocol implementation. 129 * Per RFC 768, August, 1980. 130 */ 131 132 extern struct protosw inetsw[]; 133 static void udp6_detach(struct socket *so); 134 135 static int 136 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 137 struct sockaddr_in6 *fromsa) 138 { 139 struct socket *so; 140 struct mbuf *opts = NULL, *tmp_opts; 141 struct udpcb *up; 142 143 INP_LOCK_ASSERT(inp); 144 145 /* 146 * Engage the tunneling protocol. 147 */ 148 up = intoudpcb(inp); 149 if (up->u_tun_func != NULL) { 150 in_pcbref(inp); 151 INP_RUNLOCK(inp); 152 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0], 153 up->u_tun_ctx); 154 INP_RLOCK(inp); 155 return (in_pcbrele_rlocked(inp)); 156 } 157 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 158 /* Check AH/ESP integrity. */ 159 if (IPSEC_ENABLED(ipv6)) { 160 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 161 m_freem(n); 162 return (0); 163 } 164 } 165 #endif /* IPSEC */ 166 #ifdef MAC 167 if (mac_inpcb_check_deliver(inp, n) != 0) { 168 m_freem(n); 169 return (0); 170 } 171 #endif 172 opts = NULL; 173 if (inp->inp_flags & INP_CONTROLOPTS || 174 inp->inp_socket->so_options & SO_TIMESTAMP) 175 ip6_savecontrol(inp, n, &opts); 176 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 177 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1], 178 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6); 179 if (tmp_opts) { 180 if (opts) { 181 tmp_opts->m_next = opts; 182 opts = tmp_opts; 183 } else 184 opts = tmp_opts; 185 } 186 187 } 188 m_adj(n, off + sizeof(struct udphdr)); 189 190 so = inp->inp_socket; 191 SOCKBUF_LOCK(&so->so_rcv); 192 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 193 opts) == 0) { 194 SOCKBUF_UNLOCK(&so->so_rcv); 195 m_freem(n); 196 if (opts) 197 m_freem(opts); 198 UDPSTAT_INC(udps_fullsock); 199 } else 200 sorwakeup_locked(so); 201 return (0); 202 } 203 204 int 205 udp6_input(struct mbuf **mp, int *offp, int proto) 206 { 207 struct mbuf *m = *mp; 208 struct ifnet *ifp; 209 struct ip6_hdr *ip6; 210 struct udphdr *uh; 211 struct inpcb *inp; 212 struct inpcbinfo *pcbinfo; 213 struct udpcb *up; 214 int off = *offp; 215 int cscov_partial; 216 int plen, ulen; 217 struct epoch_tracker et; 218 struct sockaddr_in6 fromsa[2]; 219 struct m_tag *fwd_tag; 220 uint16_t uh_sum; 221 uint8_t nxt; 222 223 ifp = m->m_pkthdr.rcvif; 224 225 #ifndef PULLDOWN_TEST 226 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 227 ip6 = mtod(m, struct ip6_hdr *); 228 uh = (struct udphdr *)((caddr_t)ip6 + off); 229 #else 230 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 231 if (!uh) 232 return (IPPROTO_DONE); 233 ip6 = mtod(m, struct ip6_hdr *); 234 #endif 235 236 UDPSTAT_INC(udps_ipackets); 237 238 /* 239 * Destination port of 0 is illegal, based on RFC768. 240 */ 241 if (uh->uh_dport == 0) 242 goto badunlocked; 243 244 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 245 ulen = ntohs((u_short)uh->uh_ulen); 246 247 nxt = proto; 248 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 249 if (nxt == IPPROTO_UDPLITE) { 250 /* Zero means checksum over the complete packet. */ 251 if (ulen == 0) 252 ulen = plen; 253 if (ulen == plen) 254 cscov_partial = 0; 255 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 256 /* XXX: What is the right UDPLite MIB counter? */ 257 goto badunlocked; 258 } 259 if (uh->uh_sum == 0) { 260 /* XXX: What is the right UDPLite MIB counter? */ 261 goto badunlocked; 262 } 263 } else { 264 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 265 UDPSTAT_INC(udps_badlen); 266 goto badunlocked; 267 } 268 if (uh->uh_sum == 0) { 269 UDPSTAT_INC(udps_nosum); 270 goto badunlocked; 271 } 272 } 273 274 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 275 !cscov_partial) { 276 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 277 uh_sum = m->m_pkthdr.csum_data; 278 else 279 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 280 m->m_pkthdr.csum_data); 281 uh_sum ^= 0xffff; 282 } else 283 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 284 285 if (uh_sum != 0) { 286 UDPSTAT_INC(udps_badsum); 287 goto badunlocked; 288 } 289 290 /* 291 * Construct sockaddr format source address. 292 */ 293 init_sin6(&fromsa[0], m, 0); 294 fromsa[0].sin6_port = uh->uh_sport; 295 init_sin6(&fromsa[1], m, 1); 296 fromsa[1].sin6_port = uh->uh_dport; 297 298 pcbinfo = udp_get_inpcbinfo(nxt); 299 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 300 struct inpcb *last; 301 struct inpcbhead *pcblist; 302 struct ip6_moptions *imo; 303 304 INP_INFO_RLOCK_ET(pcbinfo, et); 305 /* 306 * In the event that laddr should be set to the link-local 307 * address (this happens in RIPng), the multicast address 308 * specified in the received packet will not match laddr. To 309 * handle this situation, matching is relaxed if the 310 * receiving interface is the same as one specified in the 311 * socket and if the destination multicast address matches 312 * one of the multicast groups specified in the socket. 313 */ 314 315 /* 316 * KAME note: traditionally we dropped udpiphdr from mbuf 317 * here. We need udphdr for IPsec processing so we do that 318 * later. 319 */ 320 pcblist = udp_get_pcblist(nxt); 321 last = NULL; 322 CK_LIST_FOREACH(inp, pcblist, inp_list) { 323 if ((inp->inp_vflag & INP_IPV6) == 0) 324 continue; 325 if (inp->inp_lport != uh->uh_dport) 326 continue; 327 if (inp->inp_fport != 0 && 328 inp->inp_fport != uh->uh_sport) 329 continue; 330 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 331 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 332 &ip6->ip6_dst)) 333 continue; 334 } 335 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 336 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 337 &ip6->ip6_src) || 338 inp->inp_fport != uh->uh_sport) 339 continue; 340 } 341 342 /* 343 * XXXRW: Because we weren't holding either the inpcb 344 * or the hash lock when we checked for a match 345 * before, we should probably recheck now that the 346 * inpcb lock is (supposed to be) held. 347 */ 348 349 /* 350 * Handle socket delivery policy for any-source 351 * and source-specific multicast. [RFC3678] 352 */ 353 imo = inp->in6p_moptions; 354 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 355 struct sockaddr_in6 mcaddr; 356 int blocked; 357 358 INP_RLOCK(inp); 359 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 360 INP_RUNLOCK(inp); 361 continue; 362 } 363 364 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 365 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 366 mcaddr.sin6_family = AF_INET6; 367 mcaddr.sin6_addr = ip6->ip6_dst; 368 369 blocked = im6o_mc_filter(imo, ifp, 370 (struct sockaddr *)&mcaddr, 371 (struct sockaddr *)&fromsa[0]); 372 if (blocked != MCAST_PASS) { 373 if (blocked == MCAST_NOTGMEMBER) 374 IP6STAT_INC(ip6s_notmember); 375 if (blocked == MCAST_NOTSMEMBER || 376 blocked == MCAST_MUTED) 377 UDPSTAT_INC(udps_filtermcast); 378 INP_RUNLOCK(inp); /* XXX */ 379 continue; 380 } 381 382 INP_RUNLOCK(inp); 383 } 384 if (last != NULL) { 385 struct mbuf *n; 386 387 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 388 NULL) { 389 INP_RLOCK(last); 390 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 391 UDP_PROBE(receive, NULL, last, ip6, 392 last, uh); 393 if (udp6_append(last, n, off, fromsa)) 394 goto inp_lost; 395 } 396 INP_RUNLOCK(last); 397 } 398 } 399 last = inp; 400 /* 401 * Don't look for additional matches if this one does 402 * not have either the SO_REUSEPORT or SO_REUSEADDR 403 * socket options set. This heuristic avoids 404 * searching through all pcbs in the common case of a 405 * non-shared port. It assumes that an application 406 * will never clear these options after setting them. 407 */ 408 if ((last->inp_socket->so_options & 409 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) 410 break; 411 } 412 413 if (last == NULL) { 414 /* 415 * No matching pcb found; discard datagram. (No need 416 * to send an ICMP Port Unreachable for a broadcast 417 * or multicast datgram.) 418 */ 419 UDPSTAT_INC(udps_noport); 420 UDPSTAT_INC(udps_noportmcast); 421 goto badheadlocked; 422 } 423 INP_RLOCK(last); 424 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 425 UDP_PROBE(receive, NULL, last, ip6, last, uh); 426 if (udp6_append(last, m, off, fromsa) == 0) 427 INP_RUNLOCK(last); 428 } else 429 INP_RUNLOCK(last); 430 INP_INFO_RUNLOCK_ET(pcbinfo, et); 431 inp_lost: 432 return (IPPROTO_DONE); 433 } 434 /* 435 * Locate pcb for datagram. 436 */ 437 438 /* 439 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 440 */ 441 if ((m->m_flags & M_IP6_NEXTHOP) && 442 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 443 struct sockaddr_in6 *next_hop6; 444 445 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 446 447 /* 448 * Transparently forwarded. Pretend to be the destination. 449 * Already got one like this? 450 */ 451 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 452 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 453 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 454 if (!inp) { 455 /* 456 * It's new. Try to find the ambushing socket. 457 * Because we've rewritten the destination address, 458 * any hardware-generated hash is ignored. 459 */ 460 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 461 uh->uh_sport, &next_hop6->sin6_addr, 462 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 463 uh->uh_dport, INPLOOKUP_WILDCARD | 464 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 465 } 466 /* Remove the tag from the packet. We don't need it anymore. */ 467 m_tag_delete(m, fwd_tag); 468 m->m_flags &= ~M_IP6_NEXTHOP; 469 } else 470 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 471 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 472 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 473 m->m_pkthdr.rcvif, m); 474 if (inp == NULL) { 475 if (udp_log_in_vain) { 476 char ip6bufs[INET6_ADDRSTRLEN]; 477 char ip6bufd[INET6_ADDRSTRLEN]; 478 479 log(LOG_INFO, 480 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 481 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 482 ntohs(uh->uh_dport), 483 ip6_sprintf(ip6bufs, &ip6->ip6_src), 484 ntohs(uh->uh_sport)); 485 } 486 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 487 UDPSTAT_INC(udps_noport); 488 if (m->m_flags & M_MCAST) { 489 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 490 UDPSTAT_INC(udps_noportmcast); 491 goto badunlocked; 492 } 493 if (V_udp_blackhole) 494 goto badunlocked; 495 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 496 return (IPPROTO_DONE); 497 } 498 INP_RLOCK_ASSERT(inp); 499 up = intoudpcb(inp); 500 if (cscov_partial) { 501 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 502 INP_RUNLOCK(inp); 503 m_freem(m); 504 return (IPPROTO_DONE); 505 } 506 } 507 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 508 if (udp6_append(inp, m, off, fromsa) == 0) 509 INP_RUNLOCK(inp); 510 return (IPPROTO_DONE); 511 512 badheadlocked: 513 INP_INFO_RUNLOCK_ET(pcbinfo, et); 514 badunlocked: 515 if (m) 516 m_freem(m); 517 return (IPPROTO_DONE); 518 } 519 520 static void 521 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 522 struct inpcbinfo *pcbinfo) 523 { 524 struct udphdr uh; 525 struct ip6_hdr *ip6; 526 struct mbuf *m; 527 int off = 0; 528 struct ip6ctlparam *ip6cp = NULL; 529 const struct sockaddr_in6 *sa6_src = NULL; 530 void *cmdarg; 531 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 532 struct udp_portonly { 533 u_int16_t uh_sport; 534 u_int16_t uh_dport; 535 } *uhp; 536 537 if (sa->sa_family != AF_INET6 || 538 sa->sa_len != sizeof(struct sockaddr_in6)) 539 return; 540 541 if ((unsigned)cmd >= PRC_NCMDS) 542 return; 543 if (PRC_IS_REDIRECT(cmd)) 544 notify = in6_rtchange, d = NULL; 545 else if (cmd == PRC_HOSTDEAD) 546 d = NULL; 547 else if (inet6ctlerrmap[cmd] == 0) 548 return; 549 550 /* if the parameter is from icmp6, decode it. */ 551 if (d != NULL) { 552 ip6cp = (struct ip6ctlparam *)d; 553 m = ip6cp->ip6c_m; 554 ip6 = ip6cp->ip6c_ip6; 555 off = ip6cp->ip6c_off; 556 cmdarg = ip6cp->ip6c_cmdarg; 557 sa6_src = ip6cp->ip6c_src; 558 } else { 559 m = NULL; 560 ip6 = NULL; 561 cmdarg = NULL; 562 sa6_src = &sa6_any; 563 } 564 565 if (ip6) { 566 /* 567 * XXX: We assume that when IPV6 is non NULL, 568 * M and OFF are valid. 569 */ 570 571 /* Check if we can safely examine src and dst ports. */ 572 if (m->m_pkthdr.len < off + sizeof(*uhp)) 573 return; 574 575 bzero(&uh, sizeof(uh)); 576 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 577 578 if (!PRC_IS_REDIRECT(cmd)) { 579 /* Check to see if its tunneled */ 580 struct inpcb *inp; 581 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 582 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 583 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 584 m->m_pkthdr.rcvif, m); 585 if (inp != NULL) { 586 struct udpcb *up; 587 588 up = intoudpcb(inp); 589 if (up->u_icmp_func) { 590 /* Yes it is. */ 591 INP_RUNLOCK(inp); 592 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 593 d, up->u_tun_ctx); 594 return; 595 } else { 596 /* Can't find it. */ 597 INP_RUNLOCK(inp); 598 } 599 } 600 } 601 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 602 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 603 cmdarg, notify); 604 } else 605 (void)in6_pcbnotify(pcbinfo, sa, 0, 606 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 607 } 608 609 void 610 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 611 { 612 613 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 614 } 615 616 void 617 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 618 { 619 620 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 621 } 622 623 static int 624 udp6_getcred(SYSCTL_HANDLER_ARGS) 625 { 626 struct xucred xuc; 627 struct sockaddr_in6 addrs[2]; 628 struct inpcb *inp; 629 int error; 630 631 error = priv_check(req->td, PRIV_NETINET_GETCRED); 632 if (error) 633 return (error); 634 635 if (req->newlen != sizeof(addrs)) 636 return (EINVAL); 637 if (req->oldlen != sizeof(struct xucred)) 638 return (EINVAL); 639 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 640 if (error) 641 return (error); 642 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 643 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 644 return (error); 645 } 646 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 647 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 648 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 649 if (inp != NULL) { 650 INP_RLOCK_ASSERT(inp); 651 if (inp->inp_socket == NULL) 652 error = ENOENT; 653 if (error == 0) 654 error = cr_canseesocket(req->td->td_ucred, 655 inp->inp_socket); 656 if (error == 0) 657 cru2x(inp->inp_cred, &xuc); 658 INP_RUNLOCK(inp); 659 } else 660 error = ENOENT; 661 if (error == 0) 662 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 663 return (error); 664 } 665 666 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 667 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 668 669 static int 670 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 671 struct mbuf *control, struct thread *td) 672 { 673 u_int32_t ulen = m->m_pkthdr.len; 674 u_int32_t plen = sizeof(struct udphdr) + ulen; 675 struct ip6_hdr *ip6; 676 struct udphdr *udp6; 677 struct in6_addr *laddr, *faddr, in6a; 678 struct sockaddr_in6 *sin6 = NULL; 679 int cscov_partial = 0; 680 int scope_ambiguous = 0; 681 u_short fport; 682 int error = 0; 683 uint8_t nxt; 684 uint16_t cscov = 0; 685 struct ip6_pktopts *optp, opt; 686 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 687 int flags; 688 struct sockaddr_in6 tmp; 689 690 INP_WLOCK_ASSERT(inp); 691 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 692 693 if (addr6) { 694 /* addr6 has been validated in udp6_send(). */ 695 sin6 = (struct sockaddr_in6 *)addr6; 696 697 /* protect *sin6 from overwrites */ 698 tmp = *sin6; 699 sin6 = &tmp; 700 701 /* 702 * Application should provide a proper zone ID or the use of 703 * default zone IDs should be enabled. Unfortunately, some 704 * applications do not behave as it should, so we need a 705 * workaround. Even if an appropriate ID is not determined, 706 * we'll see if we can determine the outgoing interface. If we 707 * can, determine the zone ID based on the interface below. 708 */ 709 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 710 scope_ambiguous = 1; 711 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 712 return (error); 713 } 714 715 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 716 IPPROTO_UDP : IPPROTO_UDPLITE; 717 if (control) { 718 if ((error = ip6_setpktopts(control, &opt, 719 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) 720 goto release; 721 optp = &opt; 722 } else 723 optp = inp->in6p_outputopts; 724 725 if (sin6) { 726 faddr = &sin6->sin6_addr; 727 728 /* 729 * Since we saw no essential reason for calling in_pcbconnect, 730 * we get rid of such kind of logic, and call in6_selectsrc 731 * and in6_pcbsetport in order to fill in the local address 732 * and the local port. 733 */ 734 if (sin6->sin6_port == 0) { 735 error = EADDRNOTAVAIL; 736 goto release; 737 } 738 739 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 740 /* how about ::ffff:0.0.0.0 case? */ 741 error = EISCONN; 742 goto release; 743 } 744 745 fport = sin6->sin6_port; /* allow 0 port */ 746 747 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 748 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 749 /* 750 * I believe we should explicitly discard the 751 * packet when mapped addresses are disabled, 752 * rather than send the packet as an IPv6 one. 753 * If we chose the latter approach, the packet 754 * might be sent out on the wire based on the 755 * default route, the situation which we'd 756 * probably want to avoid. 757 * (20010421 jinmei@kame.net) 758 */ 759 error = EINVAL; 760 goto release; 761 } 762 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 763 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 764 /* 765 * when remote addr is an IPv4-mapped address, 766 * local addr should not be an IPv6 address, 767 * since you cannot determine how to map IPv6 768 * source address to IPv4. 769 */ 770 error = EINVAL; 771 goto release; 772 } 773 774 af = AF_INET; 775 } 776 777 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 778 error = in6_selectsrc_socket(sin6, optp, inp, 779 td->td_ucred, scope_ambiguous, &in6a, NULL); 780 if (error) 781 goto release; 782 laddr = &in6a; 783 } else 784 laddr = &inp->in6p_laddr; /* XXX */ 785 if (laddr == NULL) { 786 if (error == 0) 787 error = EADDRNOTAVAIL; 788 goto release; 789 } 790 if (inp->inp_lport == 0 && 791 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 792 /* Undo an address bind that may have occurred. */ 793 inp->in6p_laddr = in6addr_any; 794 goto release; 795 } 796 } else { 797 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 798 error = ENOTCONN; 799 goto release; 800 } 801 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 802 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 803 /* 804 * XXX: this case would happen when the 805 * application sets the V6ONLY flag after 806 * connecting the foreign address. 807 * Such applications should be fixed, 808 * so we bark here. 809 */ 810 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 811 "option was set for a connected socket\n"); 812 error = EINVAL; 813 goto release; 814 } else 815 af = AF_INET; 816 } 817 laddr = &inp->in6p_laddr; 818 faddr = &inp->in6p_faddr; 819 fport = inp->inp_fport; 820 } 821 822 if (af == AF_INET) 823 hlen = sizeof(struct ip); 824 825 /* 826 * Calculate data length and get a mbuf 827 * for UDP and IP6 headers. 828 */ 829 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 830 if (m == NULL) { 831 error = ENOBUFS; 832 goto release; 833 } 834 835 /* 836 * Stuff checksum and output datagram. 837 */ 838 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 839 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 840 udp6->uh_dport = fport; 841 if (nxt == IPPROTO_UDPLITE) { 842 struct udpcb *up; 843 844 up = intoudpcb(inp); 845 cscov = up->u_txcslen; 846 if (cscov >= plen) 847 cscov = 0; 848 udp6->uh_ulen = htons(cscov); 849 /* 850 * For UDP-Lite, checksum coverage length of zero means 851 * the entire UDPLite packet is covered by the checksum. 852 */ 853 cscov_partial = (cscov == 0) ? 0 : 1; 854 } else if (plen <= 0xffff) 855 udp6->uh_ulen = htons((u_short)plen); 856 else 857 udp6->uh_ulen = 0; 858 udp6->uh_sum = 0; 859 860 switch (af) { 861 case AF_INET6: 862 ip6 = mtod(m, struct ip6_hdr *); 863 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 864 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 865 ip6->ip6_vfc |= IPV6_VERSION; 866 ip6->ip6_plen = htons((u_short)plen); 867 ip6->ip6_nxt = nxt; 868 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 869 ip6->ip6_src = *laddr; 870 ip6->ip6_dst = *faddr; 871 872 if (cscov_partial) { 873 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 874 sizeof(struct ip6_hdr), plen, cscov)) == 0) 875 udp6->uh_sum = 0xffff; 876 } else { 877 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 878 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 879 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 880 } 881 882 #ifdef RSS 883 { 884 uint32_t hash_val, hash_type; 885 uint8_t pr; 886 887 pr = inp->inp_socket->so_proto->pr_protocol; 888 /* 889 * Calculate an appropriate RSS hash for UDP and 890 * UDP Lite. 891 * 892 * The called function will take care of figuring out 893 * whether a 2-tuple or 4-tuple hash is required based 894 * on the currently configured scheme. 895 * 896 * Later later on connected socket values should be 897 * cached in the inpcb and reused, rather than constantly 898 * re-calculating it. 899 * 900 * UDP Lite is a different protocol number and will 901 * likely end up being hashed as a 2-tuple until 902 * RSS / NICs grow UDP Lite protocol awareness. 903 */ 904 if (rss_proto_software_hash_v6(faddr, laddr, fport, 905 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 906 m->m_pkthdr.flowid = hash_val; 907 M_HASHTYPE_SET(m, hash_type); 908 } 909 } 910 #endif 911 flags = 0; 912 #ifdef RSS 913 /* 914 * Don't override with the inp cached flowid. 915 * 916 * Until the whole UDP path is vetted, it may actually 917 * be incorrect. 918 */ 919 flags |= IP_NODEFAULTFLOWID; 920 #endif 921 922 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 923 UDPSTAT_INC(udps_opackets); 924 error = ip6_output(m, optp, &inp->inp_route6, flags, 925 inp->in6p_moptions, NULL, inp); 926 break; 927 case AF_INET: 928 error = EAFNOSUPPORT; 929 goto release; 930 } 931 goto releaseopt; 932 933 release: 934 m_freem(m); 935 936 releaseopt: 937 if (control) { 938 ip6_clearpktopts(&opt, -1); 939 m_freem(control); 940 } 941 return (error); 942 } 943 944 static void 945 udp6_abort(struct socket *so) 946 { 947 struct inpcb *inp; 948 struct inpcbinfo *pcbinfo; 949 950 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 951 inp = sotoinpcb(so); 952 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 953 954 INP_WLOCK(inp); 955 #ifdef INET 956 if (inp->inp_vflag & INP_IPV4) { 957 struct pr_usrreqs *pru; 958 uint8_t nxt; 959 960 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 961 IPPROTO_UDP : IPPROTO_UDPLITE; 962 INP_WUNLOCK(inp); 963 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 964 (*pru->pru_abort)(so); 965 return; 966 } 967 #endif 968 969 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 970 INP_HASH_WLOCK(pcbinfo); 971 in6_pcbdisconnect(inp); 972 inp->in6p_laddr = in6addr_any; 973 INP_HASH_WUNLOCK(pcbinfo); 974 soisdisconnected(so); 975 } 976 INP_WUNLOCK(inp); 977 } 978 979 static int 980 udp6_attach(struct socket *so, int proto, struct thread *td) 981 { 982 struct inpcb *inp; 983 struct inpcbinfo *pcbinfo; 984 int error; 985 986 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 987 inp = sotoinpcb(so); 988 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 989 990 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 991 error = soreserve(so, udp_sendspace, udp_recvspace); 992 if (error) 993 return (error); 994 } 995 INP_INFO_WLOCK(pcbinfo); 996 error = in_pcballoc(so, pcbinfo); 997 if (error) { 998 INP_INFO_WUNLOCK(pcbinfo); 999 return (error); 1000 } 1001 inp = (struct inpcb *)so->so_pcb; 1002 inp->inp_vflag |= INP_IPV6; 1003 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1004 inp->inp_vflag |= INP_IPV4; 1005 inp->in6p_hops = -1; /* use kernel default */ 1006 inp->in6p_cksum = -1; /* just to be sure */ 1007 /* 1008 * XXX: ugly!! 1009 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1010 * because the socket may be bound to an IPv6 wildcard address, 1011 * which may match an IPv4-mapped IPv6 address. 1012 */ 1013 inp->inp_ip_ttl = V_ip_defttl; 1014 1015 error = udp_newudpcb(inp); 1016 if (error) { 1017 in_pcbdetach(inp); 1018 in_pcbfree(inp); 1019 INP_INFO_WUNLOCK(pcbinfo); 1020 return (error); 1021 } 1022 INP_WUNLOCK(inp); 1023 INP_INFO_WUNLOCK(pcbinfo); 1024 return (0); 1025 } 1026 1027 static int 1028 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1029 { 1030 struct inpcb *inp; 1031 struct inpcbinfo *pcbinfo; 1032 int error; 1033 1034 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1035 inp = sotoinpcb(so); 1036 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1037 1038 INP_WLOCK(inp); 1039 INP_HASH_WLOCK(pcbinfo); 1040 inp->inp_vflag &= ~INP_IPV4; 1041 inp->inp_vflag |= INP_IPV6; 1042 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1043 struct sockaddr_in6 *sin6_p; 1044 1045 sin6_p = (struct sockaddr_in6 *)nam; 1046 1047 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1048 inp->inp_vflag |= INP_IPV4; 1049 #ifdef INET 1050 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1051 struct sockaddr_in sin; 1052 1053 in6_sin6_2_sin(&sin, sin6_p); 1054 inp->inp_vflag |= INP_IPV4; 1055 inp->inp_vflag &= ~INP_IPV6; 1056 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1057 td->td_ucred); 1058 goto out; 1059 } 1060 #endif 1061 } 1062 1063 error = in6_pcbbind(inp, nam, td->td_ucred); 1064 #ifdef INET 1065 out: 1066 #endif 1067 INP_HASH_WUNLOCK(pcbinfo); 1068 INP_WUNLOCK(inp); 1069 return (error); 1070 } 1071 1072 static void 1073 udp6_close(struct socket *so) 1074 { 1075 struct inpcb *inp; 1076 struct inpcbinfo *pcbinfo; 1077 1078 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1079 inp = sotoinpcb(so); 1080 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1081 1082 INP_WLOCK(inp); 1083 #ifdef INET 1084 if (inp->inp_vflag & INP_IPV4) { 1085 struct pr_usrreqs *pru; 1086 uint8_t nxt; 1087 1088 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1089 IPPROTO_UDP : IPPROTO_UDPLITE; 1090 INP_WUNLOCK(inp); 1091 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1092 (*pru->pru_disconnect)(so); 1093 return; 1094 } 1095 #endif 1096 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1097 INP_HASH_WLOCK(pcbinfo); 1098 in6_pcbdisconnect(inp); 1099 inp->in6p_laddr = in6addr_any; 1100 INP_HASH_WUNLOCK(pcbinfo); 1101 soisdisconnected(so); 1102 } 1103 INP_WUNLOCK(inp); 1104 } 1105 1106 static int 1107 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1108 { 1109 struct inpcb *inp; 1110 struct inpcbinfo *pcbinfo; 1111 struct sockaddr_in6 *sin6; 1112 int error; 1113 1114 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1115 inp = sotoinpcb(so); 1116 sin6 = (struct sockaddr_in6 *)nam; 1117 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1118 1119 /* 1120 * XXXRW: Need to clarify locking of v4/v6 flags. 1121 */ 1122 INP_WLOCK(inp); 1123 #ifdef INET 1124 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1125 struct sockaddr_in sin; 1126 1127 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1128 error = EINVAL; 1129 goto out; 1130 } 1131 if ((inp->inp_vflag & INP_IPV4) == 0) { 1132 error = EAFNOSUPPORT; 1133 goto out; 1134 } 1135 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1136 error = EISCONN; 1137 goto out; 1138 } 1139 in6_sin6_2_sin(&sin, sin6); 1140 inp->inp_vflag |= INP_IPV4; 1141 inp->inp_vflag &= ~INP_IPV6; 1142 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1143 if (error != 0) 1144 goto out; 1145 INP_HASH_WLOCK(pcbinfo); 1146 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1147 td->td_ucred); 1148 INP_HASH_WUNLOCK(pcbinfo); 1149 if (error == 0) 1150 soisconnected(so); 1151 goto out; 1152 } else { 1153 if ((inp->inp_vflag & INP_IPV6) == 0) { 1154 error = EAFNOSUPPORT; 1155 goto out; 1156 } 1157 } 1158 #endif 1159 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1160 error = EISCONN; 1161 goto out; 1162 } 1163 inp->inp_vflag &= ~INP_IPV4; 1164 inp->inp_vflag |= INP_IPV6; 1165 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1166 if (error != 0) 1167 goto out; 1168 INP_HASH_WLOCK(pcbinfo); 1169 error = in6_pcbconnect(inp, nam, td->td_ucred); 1170 INP_HASH_WUNLOCK(pcbinfo); 1171 if (error == 0) 1172 soisconnected(so); 1173 out: 1174 INP_WUNLOCK(inp); 1175 return (error); 1176 } 1177 1178 static void 1179 udp6_detach(struct socket *so) 1180 { 1181 struct inpcb *inp; 1182 struct inpcbinfo *pcbinfo; 1183 struct udpcb *up; 1184 1185 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1186 inp = sotoinpcb(so); 1187 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1188 1189 INP_INFO_WLOCK(pcbinfo); 1190 INP_WLOCK(inp); 1191 up = intoudpcb(inp); 1192 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1193 in_pcbdetach(inp); 1194 in_pcbfree(inp); 1195 INP_INFO_WUNLOCK(pcbinfo); 1196 udp_discardcb(up); 1197 } 1198 1199 static int 1200 udp6_disconnect(struct socket *so) 1201 { 1202 struct inpcb *inp; 1203 struct inpcbinfo *pcbinfo; 1204 1205 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1206 inp = sotoinpcb(so); 1207 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1208 1209 INP_WLOCK(inp); 1210 #ifdef INET 1211 if (inp->inp_vflag & INP_IPV4) { 1212 struct pr_usrreqs *pru; 1213 uint8_t nxt; 1214 1215 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1216 IPPROTO_UDP : IPPROTO_UDPLITE; 1217 INP_WUNLOCK(inp); 1218 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1219 (void)(*pru->pru_disconnect)(so); 1220 return (0); 1221 } 1222 #endif 1223 1224 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1225 INP_WUNLOCK(inp); 1226 return (ENOTCONN); 1227 } 1228 1229 INP_HASH_WLOCK(pcbinfo); 1230 in6_pcbdisconnect(inp); 1231 inp->in6p_laddr = in6addr_any; 1232 INP_HASH_WUNLOCK(pcbinfo); 1233 SOCK_LOCK(so); 1234 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1235 SOCK_UNLOCK(so); 1236 INP_WUNLOCK(inp); 1237 return (0); 1238 } 1239 1240 static int 1241 udp6_send(struct socket *so, int flags, struct mbuf *m, 1242 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1243 { 1244 struct inpcb *inp; 1245 struct inpcbinfo *pcbinfo; 1246 int error = 0; 1247 1248 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1249 inp = sotoinpcb(so); 1250 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1251 1252 INP_WLOCK(inp); 1253 if (addr) { 1254 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1255 error = EINVAL; 1256 goto bad; 1257 } 1258 if (addr->sa_family != AF_INET6) { 1259 error = EAFNOSUPPORT; 1260 goto bad; 1261 } 1262 } 1263 1264 #ifdef INET 1265 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1266 int hasv4addr; 1267 struct sockaddr_in6 *sin6 = NULL; 1268 1269 if (addr == NULL) 1270 hasv4addr = (inp->inp_vflag & INP_IPV4); 1271 else { 1272 sin6 = (struct sockaddr_in6 *)addr; 1273 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1274 ? 1 : 0; 1275 } 1276 if (hasv4addr) { 1277 struct pr_usrreqs *pru; 1278 uint8_t nxt; 1279 1280 nxt = (inp->inp_socket->so_proto->pr_protocol == 1281 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE; 1282 /* 1283 * XXXRW: We release UDP-layer locks before calling 1284 * udp_send() in order to avoid recursion. However, 1285 * this does mean there is a short window where inp's 1286 * fields are unstable. Could this lead to a 1287 * potential race in which the factors causing us to 1288 * select the UDPv4 output routine are invalidated? 1289 */ 1290 INP_WUNLOCK(inp); 1291 if (sin6) 1292 in6_sin6_2_sin_in_sock(addr); 1293 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1294 /* addr will just be freed in sendit(). */ 1295 return ((*pru->pru_send)(so, flags, m, addr, control, 1296 td)); 1297 } 1298 } 1299 #endif 1300 #ifdef MAC 1301 mac_inpcb_create_mbuf(inp, m); 1302 #endif 1303 INP_HASH_WLOCK(pcbinfo); 1304 error = udp6_output(inp, m, addr, control, td); 1305 INP_HASH_WUNLOCK(pcbinfo); 1306 INP_WUNLOCK(inp); 1307 return (error); 1308 1309 bad: 1310 INP_WUNLOCK(inp); 1311 m_freem(m); 1312 return (error); 1313 } 1314 1315 struct pr_usrreqs udp6_usrreqs = { 1316 .pru_abort = udp6_abort, 1317 .pru_attach = udp6_attach, 1318 .pru_bind = udp6_bind, 1319 .pru_connect = udp6_connect, 1320 .pru_control = in6_control, 1321 .pru_detach = udp6_detach, 1322 .pru_disconnect = udp6_disconnect, 1323 .pru_peeraddr = in6_mapped_peeraddr, 1324 .pru_send = udp6_send, 1325 .pru_shutdown = udp_shutdown, 1326 .pru_sockaddr = in6_mapped_sockaddr, 1327 .pru_soreceive = soreceive_dgram, 1328 .pru_sosend = sosend_dgram, 1329 .pru_sosetlabel = in_pcbsosetlabel, 1330 .pru_close = udp6_close 1331 }; 1332